1. Check the ES grouping for these employees
2. Check the dates maintained in IT0007 & the dates related to Work schedule rule.
3. Check the work schedule rule feature SCHKZ.
4. Also you need to see the holiday calendar and the work schedule generated properly or not through PT03.

It may also be that the WSR ZGEN_005 does not exist with the rest of keys 3 RR 99.

This can happen when an employee is re-assigned with a different pers area/sub area or/and EG/ESG, but the employee's IT 7 has not been changed from the org re-assignment date with the available in the new groupings. With such changes the groupings for PSAG or/and ESGG might be different as per T001A and T503.
The HR user may have pressed escape or skipped the step to copy/insert IT 7. This is a common user error. This could also impact any future leave records already created for the employee.
With org re-assignment pers action, IT 7 should be included in pers action group.

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